Venous valve, system, and method with sinus pocket

ABSTRACT

A valve with a frame and valve leaflets that provide a sinus pocket. The valve provides for unidirectional flow of a liquid through the valve.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. application Ser. No.13/913,830, filed Jun. 10, 2013, which is a continuation of U.S.application Ser. No. 13/117,770, filed May 27, 2011, issued as U.S. Pat.No. 8,460,365, on Jun. 11, 2013, which is a continuation of U.S.application Ser. No. 12/509,604 filed Jul. 27, 2009, issued as U.S. Pat.No. 7,951,189 on May 31, 2011, which is a continuation of U.S.application Ser. No. 11/232,403, filed Sep. 21, 2005, issued as U.S.Pat. No. 7,569,071 on Aug. 4, 2009, the entire content of which isincorporated herein by reference.

FIELD OF THE DISCLOSURE

The present disclosure relates to vascular medical devices, systems andmethods; and more particularly to venous valves including a venous valveframe, and methods for forming and using the venous valve frame.

BACKGROUND OF THE DISCLOSURE

The venous system of the legs uses valves and muscles as part of thebody's pumping mechanism to return blood to the heart. Venous valvescreate one way flow to prevent blood from flowing away from the heart.When valves fail, blood can pool in the lower legs resulting in swellingand ulcers of the leg. The absence of functioning venous valves can leadto chronic venous insufficiency.

Techniques for both repairing and replacing the valves exist, but aretedious and require invasive surgical procedures. Direct and indirectvalvuoplasty procedures are used to repair damaged valves. Transpositionand transplantation are used to replace an incompetent valve.Transposition involves moving a vein with an incompetent valve to a sitewith a competent valve. Transplantation replaces an incompetent valvewith a harvested valve from another venous site.

Prosthetic valves can be transplanted into the venous system, butcurrent devices are not successful enough to see widespread usage. Onereason for this is the very high percentage of prosthetic valvesreported with leaflet functional failures. These failures have beenblamed primarily on improper sizing and tilted deployment of theprosthetic valve. In addition, a great number of leaflets of theprosthetic valves ultimately become fused to the vein wall.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A and 1B illustrate an embodiment of a venous valve according tothe present disclosure.

FIGS. 2A and 2B illustrate an end view of embodiments of a venous valveaccording to the present disclosure.

FIGS. 3A-3E illustrate embodiments of valve frame configurationsaccording to the present disclosure.

FIG. 4 illustrates an embodiment of a system that includes a valveaccording to the present disclosure.

FIG. 5 illustrates an embodiment of a system that includes a valveaccording to the present disclosure.

FIGS. 6A, 6B and 6C illustrate an embodiment of a system that includes avalve according to the present disclosure.

FIGS. 7A, 7B and 7C illustrate an embodiment of a system that includes avalve according to the present disclosure.

FIGS. 8A, 8B and 8C illustrate an embodiment of a system that includes avalve and a catheter having radiopaque markers according to the presentdisclosure.

DETAILED DESCRIPTION

Embodiments of the present disclosure are directed to vascular medicaldevices, systems and methods for valve replacement and/or augmentation.Particularly, the present disclosure provides venous valve frames,venous valves that utilize the venous valve frames, and methods forforming and using the venous valve frame and the venous valve. Variousembodiments of the present disclosure can be used to replace and/oraugment an incompetent valve in a body lumen.

Embodiments of the venous valve include a venous valve frame and valveleaflets that can be implanted through minimally-invasive techniquesinto the body lumen. In one example, embodiments of the apparatus,system, and method for valve replacement or augmentation may help tomaintain antegrade blood flow, while decreasing retrograde blood flow ina venous system of individuals having venous insufficiency, such asvenous insufficiency in the legs. Use of valve embodiments can also bepossible in other portions of the vasculature.

The figures herein follow a numbering convention in which the firstdigit or digits correspond to the drawing figure number and theremaining digits identify an element or component in the drawing.Similar elements or components between different figures may beidentified by the use of similar digits. For example, 110 may referenceelement “10” in FIG. 1, and a similar element may be referenced as 210in FIG. 2. As will be appreciated, elements shown in the variousembodiments herein can be added, exchanged, and/or eliminated so as toprovide a number of additional embodiments of valve. In addition,discussion of features and/or attributes for an element with respect toone Fig. can also apply to the element shown in one or more additionalFigs. Embodiments illustrated in the figures are not necessarily toscale.

FIGS. 1A and 1B provide illustrations of various embodiments of a venousvalve 100 of the present disclosure. The venous valve 100 can beimplanted within the fluid passageway of a body lumen, such as forreplacement and/or augmentation of a valve structure within the bodylumen (e.g., a venous valve). In one embodiment, the venous valve 100 ofthe present disclosure may be beneficial to regulate the flow of abodily fluid through the body lumen in a single direction.

FIGS. 1A and 1B illustrate one embodiment of the venous valve 100.Venous valve 100 includes a venous valve frame 102 and valve leaflets104. In one embodiment, the valve frame 102 and the valve leaflets 104of the venous valve 100 can resiliently radially collapse and expand, aswill be described herein. Among other things, the valve frame 102 andthe valve leaflets 104 define a lumen 106 of the venous valve 100. Thelumen 106 allows for, amongst other things, fluid (e.g., blood) to movethrough the venous valve 100.

The valve frame 102 includes a first end 108 and a second end 110opposite the first end 108. The first end 108 and the second end 110define a length of the valve frame 102 and of the venous valve 100. Inone embodiment, the length of venous valve 100 can have a number ofvalues. As will be appreciated, the length of venous valve 100 can bedetermined based upon the location into which the venous valve 100 is tobe implanted. In other words, the length of the venous valve 100 can bepatient specific. Examples of values for the length include, but are notlimited to, 20 millimeters to 80 millimeters. Other values are alsopossible.

The valve frame 102 can be formed in a wide variety of configurations.For example, the valve frame 102 can include a first structural member112 and a second structural member 114 that together form a unitarystructure with an open frame configuration. In one embodiment, the firststructural member 112 defines an elongate base portion 116 that extendsbetween the first end 108 and the second end 110 of the valve frame 102.As illustrated, the first structural member 112 defines openings throughthe valve frame 102 to provide at least a portion of the open frameconfiguration.

In addition, the first structural member 112 also defines a firstperimeter value for the elongate base portion 116. In one embodiment,the first perimeter value can be essentially constant for the length ofthe valve frame 102. In other words, the outer limit of the area definedby the elongate base portion 116 remains essentially constant along thelength of the valve frame 102. For example, an outer surface 118 of thefirst structural member 112 can define a circular cross-sectional areafor the elongate base portion 116. As will be appreciated, othercross-sectional shapes are also possible, including but not limited tooval or elliptical.

In an alternative embodiment, the perimeter value changes along thelength of the valve frame 102. For example, the outer surface 118 of thefirst structural member 112 can change from a first cross-sectional areahaving a first value for the elongate base portion 116 adjacent thefirst end 108 and the second end 110 to a second cross-sectional areahaving a second value larger than the first value. In one embodiment,the second cross-sectional area of the outer surface 118 of the firststructural member 112 can, in conjunction with the second structuralmember 114 provide for a circular or round cross-sectional shape. Othercross-sectional shapes are also possible.

In an additional embodiment, the second structural member 114 helps todefine a bulbous portion 120 of the valve frame 102. As illustrated, thesecond structural member 114 extends radially and longitudinally fromthe outer surface 118 of an area 122 defined by the first structuralmember 112 to form the bulbous portion 120. In one embodiment, thesecond structural member 114 helps to define a second perimeter valuefor the bulbous portion 120, where second perimeter value can be isgreater than the first perimeter value.

As illustrated, the outer surface 118 of the first and second structuralmembers 112, 114 can provide a perimeter of the bulbous portion 120 andthe elongate base portion 116 having a predefined shape. For example,the first structural member 112 can define a first axis 124 of anelliptical shape and the second structural member 114 can define asecond axis 126 of the elliptical shape. In one embodiment, the lengthof the second axis 126 can be at least twenty percent (20%) greater thanthe length of the first axis 124. In an additional embodiment, thelength of the second axis 126 can be twenty percent (20%) to fiftypercent (50%) greater than the length of the first axis 124. In afurther embodiment, the length of the second axis 126 can be fortypercent (40%) to forty-two percent (42%) greater than the length of thefirst axis 124.

In an additional embodiment, the length of the second axis 126 can beone (1) to four (4) millimeters greater than the length of the firstaxis 124. As will be more fully discussed herein, this allows for a gapof one-half (0.5) to two (2) millimeters to be maintained between a freeedge of the valve leaflets 104 in their open configuration and the valveframe 102. In one embodiment, the length of the gap between each leaflet104 and the valve frame 102 can be, but is not necessarily, equal.

In an additional example, the perimeter of the bulbous portion 120 andthe elongate base portion 116 can have a round shape. For example, thefirst axis 124 of the first structure member 112 and the second axis 126of the second structural member 114 can be essentially of equal lengthalong the bulbous portion 120.

FIGS. 2A and 2B illustrate embodiments of the venous valve 200 accordingto the present disclosure. The embodiments illustrated in FIGS. 2A and2B are end views of the venous valve illustrated in FIG. 1A taken alonglines 2A-2A/2B-2B. As discussed herein, FIG. 2A illustrates the venousvalve 200 where the first structural member 212 defining the first axis224 and the second structural member 214 defining the second axis 226provide an elliptical shape for the bulbous portion 220 of the valveframe 202. FIG. 2B illustrates the venous valve 200 where the firststructural member 212 defining the first axis 224 and the secondstructural member 214 defining the second axis 226 provide a round shapefor the bulbous portion 220 of the valve frame 202.

In addition, the first structural member 112 at each of the first end108 and the second end 110 can include a first curve 128 and a secondcurve 130 opposite the first curve 128. In one embodiment, the firststructural member 112 forming the first and second curve 128, 130 canmove radially as the valve 100 radially collapses and expands. In thevarious embodiments described herein, the first and second curve 128,130 can provide a spring force (e.g., elastic potential energy) tocounter radial compression of the frame valve 102 towards itsuncompressed state. As will be appreciated, the first and second curve128, 130 can have a number of configurations, including turns definingangles and/or arcs (e.g., having a radius of curvature). Additionalspring force can be imparted to the frame 102 from the compression ofother portions of the valve frame 102 as well.

In one embodiment, the first and second curve 128, 130 at each of theends 108, 110 can lay opposite each other on a respective plane that isparallel to the other plane. In addition, the first and second curve128, 130 of the first end 108 can be positioned radially orthogonal tothe first and second curve 128, 130 of the second end 110 of the baseportion 116. As will be appreciated, the first and second curve 128, 130at each of the ends 108, 110, however, need not either lay on planesthat are parallel relative each other and/or be positioned radiallyorthogonal to each other.

The compressible nature of the valve 100 can accommodate changes in bodylumen size (e.g., diameter of the body lumen) by flexing to expandand/or contract to change the diameter of the valve frame 102. In oneembodiment, the first and second curve 128, 130 in the first structuralmember 112 can act as springs to allow the valve 100 to resilientlyradially collapse and expand. The frame 102 can also provide sufficientcontact and expansion force with the surface of a body lumen wall toencourage fixation of the valve 100 and to prevent retrograde flowwithin the body lumen around the edges of the frame 102 and the surfaceof a lumen when combined with a closed state of the valve leafletsattached thereto. Anchoring elements (e.g., barbs) can also be includedwith valve 100.

As will be appreciated, the first and second curve 128, 130 in the firststructural member 112 can also include, but are not limited to, othershapes that allow for repeatable travel between the collapsed state andthe expanded state. For example, the elastic regions can includeintegrated springs having a circular or an elliptical loopconfiguration. The embodiments are not, however, limited to theseconfigurations as other shapes are also possible.

The first structural member 112 forming the first and second curve 128,130 can also include a radial flare 132 that curves away from a centerlongitudinal axis 134. As illustrated, the radial flare 132 provides foran increase in the peripheral frame dimension at the first end 108and/or the second end 110 of the valve frame 102. In one embodiment, thefirst structural member 112 can be pre- and/or post-treated to impartthe radial flare 132. For example, the first structural member 112forming the first and second curve 128, 130 of the valve frame 102 couldbe bent to impart the radial flare 132. The frame 102 could then be heattreated so as to fix the radial flare 132 into the first structuralmember 112. Other material treatments (e.g., plastic deformation,forging, elastic deformation with heat setting) are also possible toimpart the radial flare as described herein, many of which are materialspecific.

The first structural member 112 and/or the second structural member 114of the valve frame 102 can have similar and/or different cross-sectionalgeometries and/or cross-sectional dimensions along their length. Thesimilarity and/or the differences in the cross-sectional geometriesand/or cross-sectional dimensions can be based on one or more desiredfunctions to be elicited from each portion of the frame 102. Forexample, the first structural member 112 and/or the second structuralmember 114 can have a similar cross-sectional geometry along its length.Examples of cross-sectional geometries include, but are not limited to,round (e.g., circular, oval, and/or elliptical), rectangular geometrieshaving perpendicular sides, one or more convex sides, or one or moreconcave sides; semi-circular; triangular; tubular; I-shaped; T-shaped;and trapezoidal.

Alternatively, the cross-sectional dimensions of one or more geometriesof the first structural member 112 and/or the second structural member114 can change from one portion of the frame 102 to another portion ofthe frame 102. For example, portions of the first structural member 112and/or the second structural member 114 can taper (i.e., transition)from a first geometric dimension to a second geometric dimensiondifferent than the first geometric dimension. These embodiments,however, are not limited to the present examples as othercross-sectional geometries and dimension are also possible. As such, thepresent disclosure should not be limited to the frames provided in theillustration herein.

The valve frame 102 further includes a valve leaflet connection location136 along the first structural member 112 of the valve frame 102. In oneembodiment, the valve leaflet connection location 136 includes portionsof the first structural member 112 that can define the area 122, as wellas surfaces of the first structural member 112 that define openingsthrough the frame 102. For example, the first structural member 112 caninclude surfaces that define a first opening 138 and a second opening140 for the valve leaflet connection location 136. In one embodiment,the first and second openings 138, 140 are adjacent a region of thebulbous portion 120 of the valve frame 102. The first and secondopenings 138, 140 are also illustrated as being positioned opposite eachother along a common axis 144. In the present illustration, the commonaxis 144 is along the first axis 124 of the shape (e.g., elliptical,round) formed by the first and second structural member 112, 114.

In an additional embodiment, the valve leaflet connection location 136further includes a predefined portion 146 along the first structuralmember 112 to which the valve leaflets 104 can be attached. Asillustrated, the predefined portion 146 includes a portion of the firststructural member 112 that extends between the first and second openings138, 140 in the region of the bulbous portion 120. In one embodiment,the valve leaflets 104 can be coupled to the valve frame 102 through thefirst and second openings 138, 140 and the predefined portion 146 of thefirst structural member 112.

In addition to allowing the valve leaflets 104 to be coupled to thevalve frame 102, the valve leaflet connection location 140 can alsoinclude predetermined dimensional relationships between portions of thevalve leaflet connection location 136. For example, predetermineddimensional relationships can exist between the relative positions ofthe first and second openings 138, 140 and the predefined portion 146 ofthe first structural member 112. These dimensional relationships canhelp to better position the valve leaflets 104 in relation to thebulbous portion 120 of the valve frame 102.

For example, as illustrated the predefined portion 146 of the firststructural member 112 extends away from the first and second opening138, 140 to define a distal point 148 from the first and second openings138, 140. In one embodiment, the distance between the first and secondopenings 138, 140 and a plane that is both orthogonal to the centerlongitudinal axis 134 and in contact with the distal point 148 is apredetermined length having a value of eighty-five percent (85%) ofdistance of the second axis 126.

In one embodiment, the valve leaflets 104 include a first valve leaflet150 and a second valve leaflet 152. As illustrated, the first and secondvalve leaflets 150, 152 are connected to the valve leaflet connectionlocation 136. The first and second valve leaflet 150, 152 have surfacesthat define a commissure 154 that reversibly opens and closes forunidirectional flow of a liquid through the venous valve 100. As usedherein, the commissure 154 includes portions of the valve leaflet 104surfaces that reversibly form a connection to allow fluid to flowthrough the valve 100 in essentially one direction. For example, thesurfaces of the first and second valve leaflets 150, 152 can movebetween a closed configuration in which fluid flow through the lumen 106can be restricted and an open configuration in which fluid flow throughthe lumen 106 can be permitted.

In addition, the first and second openings 138, 140 can be radiallysymmetric around the longitudinal central axis 134 of the valve frame102. As illustrated, the first and second openings 138, 140 can bepositioned approximately one hundred eighty (180) degrees relative eachother around the longitudinal central axis 134 of the frame 102. As willbe appreciated, the first and second openings 138, 140 need notnecessarily display an equally spaced symmetrical relationship asdescribed above in order to practice the embodiments of the presentdisclosure. For example, the radial relationship can have the first andsecond openings 138, 140 positioned at values greater than one hundredeighty (180) degrees and less than one hundred eighty (180) degreesrelative each other around the longitudinal central axis 134 of theframe 102.

In the present example, the first and second valve leaflet 150, 152 canbe coupled, as described more fully herein, to at least the valveleaflet connection location 136 and the predefined portion 146 of thevalve frame 102. As illustrated, the valve leaflets 104 include a region156 of the valve leaflets 104 that can move relative the valve frame102. The region 156 of the valve leaflets 104 can be unbound (i.e.,unsupported) by the frame 102 and extends between the first and secondopenings 138, 140. This configuration permits the first and second valveleaflet 150, 152 to move (e.g., pivot) relative the first and secondopenings 138, 140 to allow the commissure 154 to reversibly open andclose for unidirectional flow of the liquid through the venous valve100.

In an additional embodiment, the valve leaflets 104 in their openconfiguration have a circumference that is less than the circumferenceof the valve frame 102. For example, as illustrated, the valve leaflets104 in their open configuration include a gap 158 between a free edge160 of the first and second valve leaflets 150, 152 and the bulbousportion 120 of the valve frame 102. As discussed herein, the length ofthe second axis 126 can be one (1) to four (4) millimeters greater thanthe length of the first axis 124. In one embodiment, this allows for thegap 158 between the free edge 160 of each valve leaflet 104 in theiropen position to be one-half (0.5) to two (2) millimeters from thebulbous portion 120 of the valve frame 102. In one embodiment, thelength of the gap 158 between each leaflet 104 and the valve frame 102can be, but is not necessarily, equal.

In one embodiment, the first and second valve leaflets 150, 152 and thebulbous portion 120 of the valve frame 102 provide surfaces that definea sinus pocket 162. As illustrated, the sinus pocket 162 provides adilated channel or receptacle as compared to the elongate base portion116 of the venous valve 100. In one embodiment, the presence of thesinus pocket 162 better ensures that the valve leaflets 104 do not comeinto contact with a significant portion of the valve frame 102 and/orthe inner wall of the vessel in which the valve 100 is implanted. Forexample, the sinus pocket 162 can help prevent adhesion between thevalve leaflets 104 and the vessel wall due to the presence of a volumeof blood there between.

The sinus pocket 162 can also allows for improved valve leaflets 104dynamics (e.g., opening and closing of the valve leaflets 104). Forexample, the sinus pocket 162 can allow for pressure differentialsacross the surfaces of the valve leaflets 104 that provide for morerapid closing of the valve leaflets 104 as the retrograde blood flowbegins, as will be discussed herein.

In one embodiment, the free edge 160 of the first and second valveleaflets 150, 152 is adjacent the commissure 154. In one embodiment, thefree edge 160 has a surface that defines a curve 164 between the firstand second openings 138, 140. The curve 164 also has a bottom 166relative the first and second openings 138, 140. The free edge 160 canhave either a non-planar or a planar configuration. As illustrated, thefree edge 160 of the first and second leaflets 150, 152 define thebottom 166 of the curve 164 that is at least a predetermined distanceaway from the second structural member 114 so as to define the gap 158between the first and second leaflet 150, 152 and the second structuralmember 114.

In one embodiment, whether the free edge 160 has a planar or non-planarconfiguration can depend on what material is selected for forming thevalve leaflets 104. For example, when a stiffer material (e.g., PTFE) isused for the valve leaflets 104 the free edge 160 can have more of aconcave shape than a planar or straight shape. In other words, asillustrated in FIG. 1A, the free edge 160 transitions from a firstposition adjacent the first and second openings 138, 140 to a secondposition lower than the first position as illustrated approximatelymidway between the first and second openings 138, 140. So, the free edge160 dips down to a low point approximately midway between and relativeto the first and second openings 138, 140. In one embodiment, this shapeallows the free edge 160 to form a catenary when the valve leaflets 104are in their closed position, as illustrated in FIG. 1A. In analternative embodiment, when an elastic material is used for the valveleaflets 104 the free edge 160 has more of a straight or planar shape.In other words, the free edge 160 maintains essentially the samerelative position around the circumference of the valve leaflets 104.

In addition, the dimensions and configuration of the valve leaflets 104can further include proportional relationships to structures of thevalve frame 102. For example, the first and second leaflets 150, 152 caneach have a predetermined length between the distal point 148 and thebottom 166 of the curve 164 that is at least fifty percent (50%) greaterthan a radius of the elongate base portion 116. In one embodiment, thisdimensional relationship is taken when the valve leaflets 104 are intheir closed position.

In addition to allowing the valve leaflets 104 to be coupled to thevalve frame 102, the valve leaflet connection location 136 can alsoinclude predetermined dimensional relationships between portions of thevalve leaflet connection location 136. For example, predetermineddimensional relationships can exist between the relative positions ofthe first and second openings 138, 140 and the predefined portion 146 ofthe first structural member 112. These dimensional relationships canhelp to better position the valve leaflets 104 in relation to thebulbous portion 120 of the valve frame 102.

In an additional embodiment, a predetermined portion of the surfaces ofthe valve leaflets 150, 152 that contact to define the commissure 154can extend parallel to the center longitudinal axis 134 of the venousvalve 100 when the valve 100 is in its closed configuration (FIG. 1A).For example, the predetermined portion of the surfaces of the valveleaflets 150, 152 can include twenty percent (20%) of the predeterminedlength of the valve leaflets 150, 152 between the distal point 148 andthe bottom 166 of the curve 164. In other words, at least twenty percent(20%) of the length of the valve leaflet 150, 152 surfaces contact toform the commissure 154.

As will be appreciated, the free edge 160 when the valve leaflets 104are in their open configuration can have a non-round shape. For example,the free edge 160 can have an eye shape or an oval shape with the secondaxis extending between the first and second openings 138, 140. As willbe appreciated, other shapes for the valve leaflets 104 in their openconfiguration are also possible, including a round shape.

In one embodiment, under antegrade fluid flow (i.e., positive fluidpressure) from the second end 110 towards the first end 108 of the valve100, the valve leaflets 104 can expand toward the inner surface 170 ofthe bulbous portion 120 of the frame 102 to create an opening throughwhich fluid is permitted to move. In one example, the valve leaflets 104each expand to define a semi-tubular structure having an ovalcross-section when fluid opens the commissure 154.

As discussed herein, in the open configuration the gap 158 existsbetween the free edge 160 of the first and second valve leaflets 150,152 and the bulbous portion 120 of the valve frame 102. In oneembodiment, the size and shape of the valve leaflets 104 provides thegap 158 thereby preventing the valve leaflets 104 from touching the veinwall.

In addition, the size and shape of the valve leaflets 104 along with thegap 158 provides for more responsive opening and closing of thecommissure 154 due to hydrodynamic relationships that are formed acrossthe valve leaflets 104. For example, as the leaflets 104 are not incontact with the vessel wall and/or the bulbous portion 120 of the frame102, the leaflets 104 can be more responsive to changes in the flowdirection. The presence of the sinus pocket 162 allows slower movingfluid (e.g., blood) to move into the pocket and faster moving blood onthe flow side of the leaflet 104 to create a pressure differential. Thispressure differential across the valve leaflets 104 provides for theBernoulli effect for which an increase in fluid flow velocity thereoccurs simultaneously a decrease in pressure. So, as fluid flow becomesretrograde the fluid velocity through the opening of the valve leaflets104 is larger than the fluid flow in the sinus pocket 162. As a result,there is a lower pressure in the opening of the valve leaflets 104 thatcauses the opening to close more quickly as compared to valves withoutthe sinus pocket 162.

In an additional embodiment, the configuration of the presentembodiments allows the leaflets 104 to experience a low shear ascompared to angled leaflets which are subject to high shear and directimpact with flowing blood. This can be attributed to the alignment ofthe valve leaflets 104 with the elongate base portion 116, and theadjacent vein segment, above and below the sinus pocket 162. The sinuspocket 162 also allows for recirculation of blood within the pocket 162that cleans out potential thrombus buildup in the bottom of the pocket162.

Valve 100 provides an embodiment in which the surfaces defining thecommissure 154 provide a bi-leaflet configuration (i.e., a bicuspidvalve) for valve 100. Although the embodiments in FIGS. 1A and 1Billustrate and describe a bi-leaflet configuration for the valve of thepresent disclosure, designs employing a different number of valveleaflets (e.g., tri-leaflet valve) may be possible. For example,additional connection points (e.g., three or more) could be used toprovide additional valve leaflets (e.g., a tri-leaflet valve).

The embodiments of the frame described herein can also be constructed ofone or more of a number of materials and in a variety of configurations.The frame embodiments can have a unitary structure with an open frameconfiguration. The frame can also be self-expanding. Examples ofself-expanding frames include those formed from temperature-sensitivememory alloy which changes shape at a designated temperature ortemperature range, such as Nitinol. Alternatively, the self-expandingframes can include those having a spring-bias. In addition, the valveframe 102 can have a configuration that allows the frame embodiments beradially expandable through the use of a balloon catheter. In thisembodiment, the valve frame can be provided in separate pieces (e.g.,two frame pieces) that are delivered individually to the implant site.

The embodiments of the frame 102 can also be formed from one or morecontiguous frame members. For example, the first and second structuralmember 112, 114 of the frame 102 can be formed from a single contiguousmember. The single contiguous member can be bent around an elongatetubular mandrel to form the frame. The free ends of the singlecontiguous member can then be welded, fused, crimped, or otherwisejoined together to form the frame. In an additional embodiment, thefirst and second structural member 112, 114 of the frame 102 can bederived (e.g., laser cut, water cut) from a single tubular segment. Inan alternative embodiment, methods of joining the first and secondstructural member 112, 114 of the frame 102 to create the elastic regioninclude, but are not limited to, welding, gluing, and fusing the framemember. The frame 102 can be heat set by a method as is typically knownfor the material which forms the frame 102.

The valve frame 102 can be formed from a number of materials. Forexample, the frame can be formed from a biocompatible metal, metalalloy, polymeric material, or combination thereof. As described herein,the frame can be self-expanding or balloon expandable. In addition, theframe can be configured so as to have the ability to move radiallybetween the collapsed state and the expanded state. Examples of suitablematerials include, but are not limited to, medical grade stainless steel(e.g., 316L), titanium, tantalum, platinum alloys, niobium alloys,cobalt alloys, alginate, or combinations thereof. Additional frameembodiments may be formed from a shape-memory material, such as shapememory plastics, polymers, and thermoplastic materials. Shaped memoryalloys having superelastic properties generally made from ratios ofnickel and titanium, commonly known as Nitinol, are also possiblematerials. Other materials are also possible.

The lumen 106 can include a number of sizes. For example, the size ofthe lumen can be determined based upon the type of body lumen and thebody lumen size in which the valve is to be placed. In an additionalexample, there can also be a minimum value for the width for the framethat ensures that the frame will have an appropriate expansion forceagainst the inner wall of the body lumen in which the valve is beingplaced.

The valve 100 can further include one or more radiopaque markers (e.g.,rivets, tabs, sleeves, welds). For example, one or more portions of theframe can be formed from a radiopaque material. Radiopaque markers canbe attached to, electroplated, dipped and/or coated onto one or morelocations along the frame. Examples of radiopaque material include, butare not limited to, gold, tantalum, and platinum.

The position of the one or more radiopaque markers can be selected so asto provide information on the position, location and orientation (e.g.,axial, directional, and/or clocking position) of the valve during itsimplantation. For example, radiopaque markers can be configured radiallyand longitudinally (e.g., around and along portions of the firststructural member 112) on predetermined portions of the valve frame 102to allow the radial and axial position of the valve frame 102 to bedetermined. So in one embodiment a radiograph image of the valve frame102 taken perpendicular to the valve leaflets 104 in a first clockposition can produce a first predetermined radiograph image (e.g., animaging having the appearance of an inverted “Y”) and a radiographicimage taken perpendicular to the first and second openings 138, 140 in asecond clock position can produce a second predetermined radiographimage (e.g., an imaging having the appearance of an upright “Y”)distinguishable from the first predetermined radiograph image.

In one embodiment, the first and second predetermined radiograph imagesallow the radial position of the leaflets 104 to be better identifiedwithin the vessel. This then allows a clocking position for the valve100 to be determined so that the valve can be positioned in a morenatural orientation relative the compressive forces the valve willexperience in situ. In other words, determining the clocking of thevalve as described herein allows the valve to be radially positioned insame orientation as native valve that it's replacing and/or augmenting.

In one embodiment, the material of the valve leaflets 104 can besufficiently thin and pliable so as to permit radially-collapsing of thevalve leaflets 104 for delivery by catheter to a location within a bodylumen. The valve leaflets 104 can be constructed of a fluid-impermeablebiocompatible material that can be either synthetic or biologic.Possible synthetic materials include, but are not limited to, expandedpolytetrafluoroethylene (ePTFE), polytetrafluoroethylene (PTFE),polystyrene-polyisobutylene-polystyrene (SIBS), polyurethane, segmentedpoly(carbonate-urethane), Dacron, polyethlylene (PE), polyethyleneterephthalate (PET), silk, Rayon, Silicone, or the like. Possiblebiologic materials include, but are not limited to, autologous,allogeneic or xenograft material. These include explanted veins anddecellularized basement membrane materials (such as non-crosslinkedbladder membrane or amnionic membrane), such as small intestinesubmucosa (SIS) or umbilical vein. As will be appreciated, blends ormixtures of two or more of the materials provided herein are possible.For example, SIBS can be blended with one or more basement membranematerials.

As described herein, a number of methods exist for attaching the valveleaflets 104 to the valve frame 102. For example, when positioned overthe inter surface 114 of the frame 102, the valve leaflets 104 can besecured to the frame members 118 through the use of biocompatiblestaples, glues, sutures or combinations thereof. In an additionalembodiment, the valve leaflets 104 can be coupled to the frame members118 through the use of heat sealing, solvent bonding, adhesive bonding,or welding the valve leaflets 104 to either a portion of the valveleaflets 104 (i.e., itself) and/or the frame 102.

With respect to coupling the valve leaflets 104 to the first and secondopenings 138, 140 and the other portions of the valve leaflet connectionlocation 136, the valve leaflets 104 can be passed from the innersurface 170 of the first structural member 112 and wrapped around atleast a portion of the outer surface 118 adjacent the first and secondopenings 138, 140. For example, securing the valve leaflets 104 at thefirst and second openings 138, 140 can be accomplished by makinglongitudinal cuts of a predetermined length into the valve leaflets 104adjacent the first and second openings 138, 140. In one embodiment, eachcut creates two flaps adjacent each of the first and second openings138, 140. The flaps can then pass through the frame adjacent the firstand second openings 138, 140 and each of the two resulting flaps can bewrapped from the inner surface 170 around the frame 102 to the outersurface 118. The valve leaflets 104 can then be coupled to itself and/orthe frame 102, as described herein. In addition, sutures can be passedthrough the first and second openings 138, 140 and the valve leaflets104 so as to secure the valve leaflets 104 to the frame 102. In oneembodiment, providing the flaps as described allows for the valveleaflets 104 to create a more fluid tight commissure 154 in the areaadjacent the first and second openings 138, 140.

The valve leaflets 104 can have a variety of sizes and shapes. Forexample, each of the valve leaflets 104 can have a similar size andshape. Alternatively, each of the valve leaflets 104 need not have asimilar size and shape (i.e., the valve leaflets can have a differentsize and shape with respect to each other).

In an additional embodiment, the valve leaflets 104 can include one ormore support structures, where the support structures can be integratedinto and/or onto the valve leaflets 104. For example, the valve leaflets104 can include one or more support ribs having a predetermined shape.In one embodiment, the predetermined shape of the support ribs caninclude a curved bias so as to provide the valve leaflets 104 with acurved configuration. Support ribs can be constructed of a flexiblematerial and have dimensions (e.g., thickness, width and length) andcross-sectional shape that allows the support ribs to be flexible whenthe valve leaflets 104 are urged into an open position, and stiff whenthe valve leaflets 104 are urged into a closed position uponexperiencing sufficient back flow pressure from the direction downstreamfrom the valve. In an additional embodiment, support ribs can also beattached to frame 102 so as to impart a spring bias to the valveleaflets in either the open or the closed configuration.

As described herein, the valve leaflets 104 can be located over at leastthe inner surface 170 of the frame 102. FIGS. 1A and 1B illustrate anembodiment of this configuration, where the material of the valveleaflets 104 extends over the inner surface 170 and the outer surface118 of the first structural member 112 in the valve leaflet connectionlocation 136, as described herein. Numerous techniques may be employedto laminate or bond the material of the valve leaflets 104 on the outersurface 118 and/or the inner surface 170 of the frame 102, includingheat setting, adhesive welding, application of uniform force and otherbonding techniques. The material of the valve leaflets 104 can also bejoined to itself and/or the first structural member 112 according to themethods described in U.S. Patent Application Publication US 2002/0178570to Sogard et al., which is hereby incorporated by reference in itsentirety.

The material can also be coupled to the valve leaflet connectionlocation 136 of the first structural member 112 so as to form the valveleaflets 104, as described herein. In one embodiment, the material forthe valve leaflets 104 can be in the form of a sheet or a sleeve ofmaterial, as described herein, which can be connected to the frame 102.Alternatively, the material for the valve leaflets 104 can initially bein the form of a liquid that can be used to cast and/or form the valveleaflets 104 over the frame 102. Other forms, including intermediateforms, of the valve leaflets 104 are also possible.

The material of the valve leaflets 104 can be coupled to the valveleaflet connection location 136 of the first structural member 112,including the first and second openings 138, 140, in a variety of waysso as to provide the various embodiments of the valve of the presentdisclosure. For example, a variety of fasteners can be used to couplethe material of the valve leaflets 104 to the frame 102 so as to formthe valve 100. Suitable fasteners can include, but are not limited to,biocompatible staples, glues, sutures or combinations thereof. In anadditional embodiment, the material of the valve leaflets 104 can becoupled to the frame 102 through the use of heat sealing, solventbonding, adhesive bonding, or welding the material of the valve leaflets104 to either a portion of the valve leaflets 104 (i.e., itself) and/orthe frame 102.

The valve leaflets 104 may also be treated and/or coated with any numberof surface or material treatments. For example, the valve leaflets 104can be treated with one or more biologically active compounds and/ormaterials that may promote and/or inhibit endothelization and/or smoothmuscle cell growth of the valve leaflets 104. Similarly, the valveleaflets 104 may be seeded and covered with cultured tissue cells (e.g.,endothelial cells) derived from a either a donor or the host patientwhich are attached to the valve leaflets 104. The cultured tissue cellsmay be initially positioned to extend either partially or fully over thevalve leaflets 104.

Valve leaflets 104 can also be capable of inhibiting thrombus formation.Additionally, valve leaflets 104 may either prevent or facilitate tissueingrowth there through, as the particular application for the valve 100may dictate. For example, valve leaflets 104 on the outer surface 112may be formed from a porous material to facilitate tissue ingrowth therethrough, while valve leaflets 104 on the inner surface 114 may be formedfrom a material or a treated material which inhibits tissue ingrowth.

FIGS. 3A through 3E provide illustrations of different configurations ofthe valve frame 302 that have been cut to provide them in a planar view.As illustrated, the valve frame 302 includes the first and secondstructural members 312, 314 that form the elongate base portion 316 andthe bulbous portion 320, respectively. In one embodiment, the first andsecond structural members 312, 314 of the elongate base portion 316 andthe bulbous portion 320 can include a series of interconnected members.These interconnected members, in one embodiment, can act as springmembers to help retain the expanded shape of the valve frame 302. In oneembodiment, the interconnection of these members allows for the springforce of aligned springs integrated into the frame 302 to be added inseries so as to increase the spring force potential of the frame 302.

As illustrated, the first and second structural members 312, 314 canhave a number of different configurations that provide the elongate baseportion 316 and the bulbous portion 320. As will be appreciated, otherconfigurations are possible that provide the bulbous portion 320 and/orthe elongate base portion 316. In addition, the bulbous portion 320 ofthe valve frame 302 can have a number of different configurations so asto provide the sinus pocket, as discussed herein. For example, thebulbous portion 320 can have one or more of a spherical, semi-spherical,oviod, semi-oviod, conical, semi-conical, torus, semi-torus,cylindrical, and semi-cylindrical. In addition, each of two or more ofthe sinus pockets of the valve frame 302 can have different shapes asdiscussed herein. In other words, the need not have the same shape asthe other sinus pocket of the valve frame 302.

In addition, the first and second structural members 312, 314 can eachhave two or more cross-sectional shapes and/or two or more differentdimensions (e.g., a greater width and depth of the first and secondstructural members 312, 314 for the portions of the elongate baseportion 316 and/or the bulbous portion 320 as compared to the remainderof the elongate base and/or bulbous portion 316, 320.

As illustrated, the valve frame 302 can include the valve leafletconnection region 336 for coupling the valve leaflets. As discussedherein, the valve leaflet connection region 336 can include the firstand second opening 338, 340 and the predetermined portion 346 of thefirst structural member 312.

FIG. 4 illustrates one embodiment of a system 480. System 480 includesvalve 400, as described herein, reversibly joined to catheter 482. Thecatheter 482 includes an elongate body 484 having a proximal end 486 anda distal end 488, where valve 400 can be located between the proximalend 486 and distal end 488. The catheter 482 can further include a lumen490 longitudinally extending to the distal end 488. In one embodiment,lumen 490 extends between proximal end 486 and distal end 488 ofcatheter 482. The catheter 482 can further include a guidewire lumen 492that extends within the elongate body 484, where the guidewire lumen 492can receive a guidewire for positioning the catheter 482 and the valve400 within a body lumen (e.g., a vein of a patient).

The system 480 can further include a deployment shaft 494 positionedwithin lumen 490, and a sheath 496 positioned adjacent the distal end488. In one embodiment, the valve 400 can be positioned at leastpartially within the sheath 496 and adjacent the deployment shaft 494.For example, the valve 400 can be fully or partially sheathed with thesheath 496. The deployment shaft 494 can be moved within the lumen 490to deploy valve 400. For example, deployment shaft 494 can be used topush valve 400 from sheath 496 in deploying valve 400.

FIG. 5 illustrates an additional embodiment of the system 580. Thecatheter 582 includes elongate body 584, lumen 590, a retraction system598 and a retractable sheath 596. The retractable sheath 596 can bepositioned over at least a portion of the elongate body 584, where theretractable sheath 596 can move longitudinally along the elongate body584. The valve 500 can be positioned at least partially within theretractable sheath 596, where the retractable sheath 596 moves along theelongate body 596 to deploy the valve 500. For example, the valve 500can be fully or partially sheathed with the sheath 596.

In one embodiment, retraction system 598 includes one or more wires 501coupled to the retractable sheath 596, where the wires are positioned atleast partially within and extend through lumen 590 in the elongate body584. Wires of the retraction system 598 can then be used to retract theretractable sheath 596 in deploying valve 500. In one embodiment, aportion of the elongate body 584 that defines the guidewire lumen 592extends through the lumen 506 of the valve 500 to protect the valve 500from the movement of the guidewire 509.

FIGS. 6A-6C illustrate an additional embodiment of the system 680. Thesystem 680 includes a tubular sheath 611 having an elongate body 613 anda lumen 615. The system 680 further includes a delivery shaft 617positioned within the lumen 615 of the tubular sheath 611. In oneembodiment, the tubular sheath 611 and the delivery shaft 617 can movelongitudinally relative each other.

In one embodiment, the system 680 includes a flexible cover 619 betweenthe tubular sheath 611 and the delivery shaft 617. In one embodiment,the flexible cover 619 is connected to the tubular sheath 611 and thedelivery shaft 617 at a fluid tight seal 621 so as to prevent thetransmission of friction from the elongate body 613 to device 600 whilethe elongate body 613 is retracted during the deployment cycle. In oneembodiment, this can be accomplished by creating intentional frictionsurfaces between the elongate body 613 and flexible cover 619 as isdemonstrated in FIG. 6A or two layers of the flexible cover 619 as isdemonstrated in FIG. 6B.

In one embodiment, the tubular sheath 611, the delivery shaft 617 andthe flexible cover 619 can each be formed from a number of differentmaterials. For the tubular sheath examples include, but are not limitedto materials selected from one or more of ePTFE, PTFE, PE, PET,silicone, and polyurethanes. For the delivery shaft 617 examplesinclude, but are not limited to, those selected from a metal, a metalalloy, and/or a polymer. Examples include, but are not limited one ormore of ePTFE, PTFE, PE, nylons, PET, silicone, polyurethanes, andstainless steel (e.g., 316L).

In addition, the delivery shaft 617 can also include a configurationthat imparts sufficient column rigidity to allow it to be pushed and/orpulled through the lumen 615. For example, the delivery shaft 617 can beformed with reinforcing members bound within the body of the deliveryshaft 617 (e.g., an elongate braid of stainless steel co-extruded with apolymer). For the flexible cover 619 examples include, but are notlimited to, materials selected from one or more of ePTFE, PTFE, PE, PET,nylons, and polyurethanes. As will be appreciated, other materials andconfigurations for forming the tubular sheath 611, the delivery shaft617 and the flexible cover 619 are also possible.

As illustrated in FIGS. 6A-6C, the valve 600 can be positioned over thedelivery shaft 615 adjacent a distal end 623 of the delivery shaft 617.In addition, the valve 600 can be held in the same relative location 625as it is being deployed. As illustrated in FIG. 6A, the valve 600, aportion of the flexible cover 619 and the delivery shaft 617 can bepositioned within the lumen 615 of the tubular sheath 611. In oneembodiment, the configuration illustrated in FIG. 6A allows the valve600 to be delivered in its compressed state to a predetermined locationin the lumen of the body. Once at the predetermined location, the sheath611 can then be moved relative the delivery shaft 617. FIG. 6Billustrates a situation where the sheath 611 has been pulled over thevalve 600 location 625 and at least partially over the delivery shaft617.

As illustrated, the flexible cover 619 has a tubular configuration thatfolds back inside of itself (i.e., its lumen) as the tubular sheath 611is drawn over the valve 600 and the delivery shaft 617. In oneembodiment, the lumen 615 of the sheath 611 can contain a lubricatingfluid (e.g., saline) to allow the flexible cover 619 to more easily passover itself as illustrated. As the tubular sheath 611 continues to bepulled back relative the delivery shaft 617 until the valve 600 isreleased, as illustrated in FIG. 6C. In one embodiment, the valve 600can include a self-expanding frame that allows the valve 600 to deployat location 625 once released.

FIGS. 7A-7C illustrate an additional embodiment of the system 780. Thesystem 780 includes a tubular sheath 711 having an elongate body 713 anda lumen 715. The system 780 further includes a delivery shaft 717positioned within the lumen 715 of the tubular sheath 711. In oneembodiment, the tubular sheath 711 and the delivery shaft 717 can movelongitudinally relative each other. In contrast to the systemillustrated in FIGS. 6A-6C, however, the system 780 does not include theflexible cover. As a result, the illustrated embodiment of system 780allows for an increase in the size of the inner diameter of the elongatebody 713 to be used by the delivery shaft and/or the valve 700 ascompared to the elongate body that includes the flexible cover.

In one embodiment, the tubular sheath 711 and the delivery shaft 717 caneach be formed from materials and have configurations as discussedherein for FIGS. 6A-6C. As illustrated in FIGS. 7A-7C, the valve 700 canbe positioned over the delivery shaft 715 adjacent a distal end 723 ofthe delivery shaft 717. In addition, the valve 700 can be held in thesame relative location 725 as it is being deployed. As illustrated inFIG. 7A, the valve 700 and the delivery shaft 717 can be positionedwithin the lumen 715 of the tubular sheath 711. In one embodiment, theconfiguration illustrated in FIG. 7A allows the valve 700 to bedelivered in its compressed state to a predetermined location in thelumen of the body. Once at the predetermined location, the sheath 711can then be moved relative the delivery shaft 717. FIG. 7B illustrates asituation where the sheath 711 has been pulled at least partially overthe valve 700 at location 725 and at least partially over the deliveryshaft 717. As the tubular sheath 711 continues to be pulled backrelative the delivery shaft 717 the valve 700 is released, asillustrated in FIG. 7C. In one embodiment, the valve 700 can include aself-expanding frame that allows the valve 700 to deploy at location 725once released.

The embodiments of the present disclosure further include methods forforming the valve of the present disclosure, as described herein. Forexample, the valve frame can be formed in a number of different ways. Inone embodiment, the valve frame can be formed by cutting a tube ofmaterial so as to form the first structural member into the elongatebase portion and/or the second structural member into the bulbousportion of the valve frame. Examples of techniques for cutting includelaser cutting and/or water jet cutting. Other cutting techniques arealso possible. When the first structural member and the secondstructural member are formed separately, the two portions can be joinedby a welding technique, such as laser welding. Other welding or bondingtechniques are also possible.

Forming the second structural member into the bulbous portion thatradially and longitudinally extends from the first structural member canbe accomplished through a variety of techniques. For example, the tubeof material that is cut to form the first and second structural memberscan either be formed with or have a bulbous portion bent into the tubeof material. In other words, the tube has the bulbous portion beforecutting out the first and second structural members.

Alternatively, the first and second structural members can be cut fromthe tube. The bulbous portion can then be bent into the secondstructural members of the valve frame to form the bulbous portion. Asdiscussed herein, forming the bulbous portion can include shaping thefirst structural member and the second structural member into apredetermined shape, such as elliptical or round. Other shapes for thebulbous portion are also possible.

The valve frame can then be positioned over a mandrel having surfacesthat support the elongate base portion and the bulbous portion of thevalve frame. Once positioned, the valve frame can then be processedaccording to the material type used for the frame. For example, thevalve frame can be heated on the mandrel to set the shape of the valveframe according to techniques as are known.

The method also includes providing the material in predefined shapes forthe valve leaflets. The valve leaflet material is applied and coupled tothe valve leaflet connection location of the valve frame, as discussedherein, to provide at least the first leaflet and the second leaflet ofthe valve having surfaces defining the reversibly sealable opening forunidirectional flow of a liquid through the valve. In one embodiment,the opening defined by the valve leaflets can be configured, asdiscussed herein, to create a Bernoulli Effect across the valveleaflets.

In one embodiment, coupling the material of the valve leaflets to thevenous valve frame includes locating the free edge of the valve leafletsadjacent the bulbous portion to provide both the gap and the sinuspocket between the bulbous portion in the venous valve frame and thevalve leaflets. As discussed herein, coupling the material of the valveleaflets to the venous valve frame can include configuring the valveleaflets such that at least the gap between the free edge of the valveleaflets and the bulbous portion in the venous valve frame is maintainedas the valve leaflets cycles between their opened and closed position.

In an additional example, the valve can be reversibly joined to thecatheter, which can include a process of altering the shape of the valvefrom a first shape, for example an expanded state, to the compressedstate, as described herein. For example, the valve can be reversiblyjoined with the catheter by positioning valve in the compressed state atleast partially within the sheath of the catheter. In one embodiment,positioning the valve at least partially within the sheath of thecatheter includes positioning the valve in the compressed state adjacentthe deployment shaft of the catheter. In an another embodiment, thesheath of the catheter functions as a retractable sheath, where thevalve in the compressed state can be reversibly joined with the catheterby positioning the valve at least partially within the reversible sheathof the catheter. In a further embodiment, the catheter can include aninflatable balloon, where the balloon can be positioned at leastpartially within the lumen of the valve, for example, in its compressedstate.

The embodiments of the valve described herein may be used to replace,supplement, or augment valve structures within one or more lumens of thebody. For example, embodiments of the present disclosure may be used toreplace an incompetent venous valve and help to decrease backflow ofblood in the venous system of the legs.

In one embodiment, the method of replacing, supplementing, and/oraugmenting a valve structure can include positioning at least part ofthe catheter including the valve at a predetermined location within thelumen of a body. For example, the predetermined location can include aposition within a body lumen of a venous system of a patient, such as avein of a leg.

In one embodiment, positioning the catheter that includes the valvewithin the body lumen of a venous system includes introducing thecatheter into the venous system of the patient using minimally invasivepercutaneous, transluminal catheter based delivery system, as is knownin the art. For example, a guidewire can be positioned within a bodylumen of a patient that includes the predetermined location. Thecatheter, including valve, as described herein, can be positioned overthe guidewire and the catheter advanced so as to position the valve ator adjacent the predetermined location.

As described herein, the position of the one or more radiopaque markerscan be selected so as to provide information on the position, locationand orientation (e.g., axial, directional, and/or clocking position) ofthe valve during its implantation. For example, radiopaque markers canbe configured radially and longitudinally on predetermined portions ofthe valve frame and/or the elongate body of the catheter to indicate notonly a longitudinal position, but also a radial position of the valveleaflets and the valve frame (referred to as a clock position). In oneembodiment, the radiopaque markers are configures to provideradiographic images that indicate the relative radial position of thevalve and valve leaflets on the catheter.

FIGS. 8A-8C provide an illustration of the radiopaque markers 827associated with the elongate body 884 of the catheter 882. Asillustrated, the radiopaque markers 827 include a radial component 829and a longitudinal component 831. Depending upon the radial position ofthe catheter 882, the radiopaque markers 827 can provide a different anddistinguishable radiographic image. For example, in a first position 833illustrated in FIG. 8A the longitudinal component 831 of the radiopaquemarkers 827 are aligned so as to overlap. As the catheter 882 isrotated, as illustrated in FIGS. 8B and 8C, the radiographic image ofthe radial component 829 and/or longitudinal component 831 of theradiopaque markers 827 changes.

The change in the relationship of the radial and longitudinal components829, 831 as the catheter 882 is rotated allows for the relative positionof the valve 800, valve frame and valve leaflets to be determined fromthe radiographic image. For example, the relative position of the firstand second leaflet connection regions 826, 828 could be aligned withlongitudinal component 831 of the radiopaque markers 827. This wouldallow the clock position for the valve 800 to be determined so that thevalve can be positioned in a more natural orientation relative thecompressive forces the valve will experience in situ. In other words,the allowing for clocking of the valve 800 as described herein allowsthe valve to be radially positioned in same orientation as native valvethat it's replacing and/or augmenting.

As will be appreciated, other relative relationships between theradiopaque markers 827 and the position of the valve 800 on the catheter882 are possible. So, embodiments of the present disclosure should notbe limited to the present example. For example, additional radiopaquemarkers 827 on the valve 800 could be used either alone or incombination with radiopaque markers 827 on the catheter 882 to help inpositioning the valve 800 within a lumen.

The valve can be deployed from the catheter at the predeterminedlocation in a number of ways, as described herein. In one embodiment,valve of the present disclosure can be deployed and placed in a numberof vascular locations. For example, valve can be deployed and placedwithin a major vein of a patient's leg. In one embodiment, major veinsinclude, but are not limited to, those of the peripheral venous system.Examples of veins in the peripheral venous system include, but are notlimited to, the superficial veins such as the short saphenous vein andthe greater saphenous vein, and the veins of the deep venous system,such as the popliteal vein and the femoral vein.

As described herein, the valve can be deployed from the catheter in anumber of ways. For example, the catheter can include the retractablesheath in which valve can be at least partially housed, as describedherein. Valve can be deployed by retracting the retractable sheath ofthe catheter, where the valve self-expands to be positioned at thepredetermined location. In an additional example, the catheter caninclude a deployment shaft and sheath in which valve can be at leastpartially housed adjacent the deployment shaft, as described herein.Valve can be deployed by moving the deployment shaft through thecatheter to deploy valve from the sheath, where the valve self-expandsto be positioned at the predetermined location. In an additionalembodiment, the valve can be deployed through the use of an inflatableballoon.

Once implanted, the valve can provide sufficient contact and expansionforce against the body lumen wall to prevent retrograde flow between thevalve and the body lumen wall. For example, the valve can be selected tohave a larger expansion diameter than the diameter of the inner wall ofthe body lumen. This can then allow valve to exert a force on the bodylumen wall and accommodate changes in the body lumen diameter, whilemaintaining the proper placement of valve. As described herein, thevalve can engage the lumen so as to reduce the volume of retrograde flowthrough and around valve. It is, however, understood that some leakingor fluid flow may occur between the valve and the body lumen and/orthrough valve leaflets.

In addition, the use of both the bulbous portion and/or elongate baseportion of the valve can provide a self centering aspect to valve withina body lumen. In one embodiment, the self centering aspect resultingfrom the bulbous portion and/or elongate base portion of the valve mayallow valve to maintain a substantially coaxial alignment with the bodylumen (e.g., such as a vein) as valve leaflets deflect between the openand closed configurations so as to better seal the reversible openingwhen valve is closed.

While the present disclosure has been shown and described in detailabove, it will be clear to the person skilled in the art that changesand modifications may be made without departing from the scope of thedisclosure. As such, that which is set forth in the foregoingdescription and accompanying drawings is offered by way of illustrationonly and not as a limitation. The actual scope of the disclosure isintended to be defined by the following claims, along with the fullrange of equivalents to which such claims are entitled.

In addition, one of ordinary skill in the art will appreciate uponreading and understanding this disclosure that other variations for thedisclosure described herein can be included within the scope of thepresent disclosure. For example, the frame 102 and/or the valve leaflets104 can be coated with a non-thrombogenic biocompatible material, as areknown or will be known.

In the foregoing Detailed Description, various features are groupedtogether in several embodiments for the purpose of streamlining thedisclosure. This method of disclosure is not to be interpreted asreflecting an intention that the embodiments of the disclosure requiremore features than are expressly recited in each claim. Rather, as thefollowing claims reflect, inventive subject matter lies in less than allfeatures of a single disclosed embodiment. Thus, the following claimsare hereby incorporated into the Detailed Description, with each claimstanding on its own as a separate embodiment.

1. (canceled)
 2. A valve for implantation within a body lumen,comprising: an elongate valve frame configured to shift between acollapsed configuration and an expanded configuration, wherein the valveframe is configured to exert a radially outward force against a wall ofthe body lumen in the expanded configuration; a first valve leaflet anda second valve leaflet attached to the valve frame and defining a lumenthrough the valve, the first and second valve leaflets having an openconfiguration configured to permit flow of a bodily fluid therethroughand a closed configuration configured to restrict flow of the bodilyfluid therethrough; wherein an outer surface of the valve frame definesa cross-sectional area of the valve having a non-circular shape in theexpanded configuration.
 3. The valve of claim 2, wherein the radiallyoutward force prevents retrograde flow of the bodily fluid around theouter surface the valve frame when the first valve leaflet and thesecond valve leaflet are in the closed configuration.
 4. The valve ofclaim 2, wherein the non-circular shape is defined by a first dimensionand a second dimension each measured perpendicular to a centrallongitudinal axis of the lumen through the valve, wherein the firstdimension is greater than the second dimension.
 5. The valve of claim 4,wherein the non-circular shape is ovoid.
 6. The valve of claim 2,wherein the valve is configured to resiliently radially collapse andexpand for percutaneous delivery within a delivery catheter.
 7. Thevalve of claim 2, wherein the valve frame is configured for repeatabletravel between the collapsed configuration and the expandedconfiguration.
 8. The valve of claim 2, wherein the first valve leafletand the second valve leaflet define a commissure that reversibly opensand closes for unidirectional flow of the bodily fluid therethrough. 9.The valve of claim 2, wherein the first valve leaflet and the secondvalve leaflet each have a free edge, the free edges defining acircumference that is less than a circumference of the valve frame inthe open configuration.
 10. The valve of claim 9, wherein the free edgeshave a planar configuration.
 11. The valve of claim 9, wherein the freeedges have a non-planar configuration.
 12. The valve of claim 2, whereina surface of the first valve leaflet is configured to contact a surfaceof the second valve leaflet in the closed configuration to define acommissure, wherein a predetermined portion of the surfaces of the valveleaflets that contact to define the commissure extend parallel to acentral longitudinal axis of the valve in the closed configuration. 13.The valve of claim 2, wherein first valve leaflet and the second valveleaflet define a semi-tubular structure having an oval cross-section inthe open configuration.
 14. The valve of claim 2, wherein the valve isconfigured to replace an existing valve structure within the body lumen.15. The valve of claim 2, wherein the valve is configured to augment anexisting valve structure within the body lumen.